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arlik [135]
2 years ago
6

In a second grade class containing 13 girls and 10 boys, 2 students are selected at random to give out the math papers. what is

the probability that the second student chosen is a boy, given that the first one was a girl?
Mathematics
1 answer:
Natali5045456 [20]2 years ago
4 0
The fact that the first chosen student was a girl is already decided, so there is no need to find the probability of that happening. There are a total of 13+10, or 23 students. A girl was already selected, so that leaves 22 students. The chance that a boy is chosen is 10/22, or 5/11.
You might be interested in
Why does multiplying a + bi by the complex conjugate a -bi eliminate I from the expression
navik [9.2K]

<u>EXPLANATION</u>

The reason is that

i^2=-1


If we multiply a+bi by its conjugate a-bi


We obtain;


(a+bi)(a-bi)

This is difference of two squares so we obtain;


(a+bi)(a-bi)=a^2-(bi)^2


This further gives us,

(a+bi)(a-bi)=a^2-b^2i^2

Since the i^2=-1, we substite to get;

(a+bi)(a-bi)=a^2-b^2(-1)

The i is now eliminated and we get,


(a+bi)(a-bi)=a^2+b^2






6 0
2 years ago
1: This year Cornell's class took one more than three times as many field trips as last year's class. This Year, Cornell's class
S_A_V [24]
Cornell- 2 trips   Jamyra- 23 mins studying   James- 182 bucks   Kaya- 5.5 hours   Runner-up- 4.5   Anthony-160 bucks   Jasmine-39 years old   Ronnie- 7.5 hours working.
6 0
2 years ago
Emily is a songwriter who collects royalties on her songs whenever they are played in a commercial or a movie. Emily will earn $
Hitman42 [59]

Answer:

(6,2)

Step-by-step explanation:

Variable Definitions:

​x= the number of commercials

y= the number of movies

Each commercial earns Emily $50, so x commercials would earn her 50x dollars in royalties. Each movie earns Emily $150, so y movies would earn her 150y dollars in royalties. Therefore, the total royalties 50x+150y equals $600:

50x+150y=600

Since Emily's songs were played on 3 times as many commercials as movies, if we multiply 3 by the number of movies, we will get the number of commercials, meaning x equals 3y.

x=3y

Write System of Equations:

​50x+150y=600

x=3y

Solve for y in each equation:

1)  50x+150y=600

   150y=−50x+600

   y=-1/3x+4

2)  x=3y

    y=1/3x

The x variable represents the number of commercials and the yy variable represents the number of movies. Since the lines intersect at the point (6,2) we can say:

Emily's songs were played on 6 commercials and 2 movies.

​

 

4 0
1 year ago
HELP!!!
NikAS [45]
Answer:

I believe it’s the 3rd one.

Explanation:

It’s the only graph where it looks like (2.5,5) was graphed.
7 0
1 year ago
Read 2 more answers
Round 4.265 to the nearest hundredth
jekas [21]
4.265 rounded to the nearest hundredth is 4.27
3 0
2 years ago
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